American Medical Certification Association (AMCA) Phlebotomy Practice Exam

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Which vitamin must be protected from light?

  1. Vitamin C

  2. Vitamin D

  3. Vitamin B12

  4. Vitamin A

The correct answer is: Vitamin B12

Vitamin B12 must be protected from light because it is sensitive to photodegradation, which can lead to a loss of its potency and effectiveness. When exposed to light, especially ultraviolet light, vitamin B12 can break down and lose its nutritional value. This is particularly important in laboratory settings and when storing supplements, as proper storage conditions help ensure that vitamin B12 retains its integrity for therapeutic use. In contrast, while other vitamins like Vitamin C may also be sensitive to light to some extent, the specific sensitivity of vitamin B12 makes it essential to handle and store it properly away from light sources to maintain its efficacy. In practice, vitamin B12 is often kept in opaque containers or stored in dark environments to prevent light exposure.

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